Retrograde Cipher 2

The program below will enable your browser to perform encryption and
decryption of texts using client side JavaScript and a pre-shared-secret.
Prior to enciphering a message move the mouse erratically and/or press random
keys to fill the entropy pool.

It's safe to enter a secret key here because the data never leaves your
computer; However, if you would like to ensure this is true you may
download
this program, inspect its source code, and execute it locally. The previous
version of Retrograde Cipher
is also available.